1. N. V. Azbelev, Li Mun Su, and R. K. Ragimkhanov, “Defining the concept of a solution to an integral equation with a discontinuous operator,” Dokl. Akad. Nauk SSSR,171, No. 2, 247–250 (1966).
2. N. V. Azbelev and Z. B. Tsalyuk, “On integral inequalities,” Mat. Sb.,56, No. 3, 325–342 (1962).
3. N. V. Azbelev and Z. B. Tsalyuk, “Uniqueness of the solution of an integral equation,” Dokl. Akad. Nauk SSSR,156, No. 2, 239–242 (1964).
4. A. A. Aizikovich, “An estimate of the difference of the solutions of two linear integral Volterra equations with retarded argument,” Tr. Izhev. Mat. Sem., Izhevsk. Mekh. Inst., No. 2, 71–73 (1974).
5. V. M. Alekseev, “A theorem on an integral inequality and some of its applications,” Mat. Sb.,68, No. 2, 251–273 (1965).